This is a discussion on 05 STi headunit wiring diagram within the Electronics/Car Audio forums, part of the Interior Mods category; Does any one have a copy of a diagram dipicting the color codes(or even listed!) for the speakers and possibly ...

I tapped into the R and L rear + and - and ran them to a line converter, and ran rcas to the amp. The converter and 200W amp are mounted under the drivers seat and the 8" subwoofer under the passenger seat. Sound volume and "bumpness" improved greatly, the stereo isnt even remotely washed out by the combination of the tire/road/wind/exhaust noises from the car.

Some of the other colors were different for the other wires so I didnt want to risk it, which is why I asked in the beginning.

Here's the link to my WRX radio connector pin-out (where BrandonWRX got the above image and wire color list). My table shows the functions for all of the other wires, and also shows the colors in different model years (since some of the wire colors change across years).

Originally Posted by BrandonWRX

Some of the other colors were different for the other wires ...

I don't understand what you mean by that. Which other wires? How exactly were they different?

The colors of all 14 wires at the radio connector in the 2004 and 2005 Impreza, WRX, RS, and STi are the same as what's shown in my pin-out table.

And to answer his other question (for anyone else who reads this thread): Pin 14 is a "remote on" signal from the stock radio for a motorized antenna or antenna amplifier. It's only "on" when you're listening to AM/FM. 2004 and later Imprezas (with the antenna in the rear glass) have an antenna amplifier in one of the rear pillars. It is activated by this signal; your radio reception will suck if you don't connect this line.

The stock radio does not have an output pin that can be used as a "remote on" for a speaker amplifier. Pin 10 (switched, +12V "accessory" power) is the best option for that.

my fault, I took it as the table being incomplete for the 2005 year so I was giving you the color codes so you could complete it. It didnt occur to me to check if they were the same from 1997 on. Helpful info

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